html,
body {
    padding: 0;
    margin: 0;
}

@for $i from 1 through 30 {
    .fz-#{10 + $i*2} {
        font-size: (10 + $i*2) + px;
    }
}

@for $i from 1 through 60 {
    .w-#{10 + $i*10} {
        width: (10 + $i*10) + px;
    }
}